US4103131A - Puffer interrupter with main and auxiliary pistons and common cylinder - Google Patents

Puffer interrupter with main and auxiliary pistons and common cylinder Download PDF

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Publication number
US4103131A
US4103131A US05/724,617 US72461776A US4103131A US 4103131 A US4103131 A US 4103131A US 72461776 A US72461776 A US 72461776A US 4103131 A US4103131 A US 4103131A
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US
United States
Prior art keywords
cylinder
main
piston
auxiliary
interrupter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/724,617
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English (en)
Inventor
Rudolf Graf
Ernst Lang
Viktor Stephanides
Richard Thaler
Hans-Rudolf Wuethrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh AG
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Filing date
Publication date
Application filed by Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
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Publication of US4103131A publication Critical patent/US4103131A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/884—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts with variable-area piston

Definitions

  • This invention relates to circuit interrupters, and more specifically relates to a novel puffer-type circuit interrupter in which a blast of electronegative gas is forced through separating contacts by a nozzle surrounding the interrupter contacts. Gas is forced through the nozzle by virtue of a piston and cylinder arrangement which defines a volume in connection with the nozzle, which volume is reduced when the interrupter is operated to open the interrupter contacts.
  • Puffer-type interrupters of the type to which the invention relates are shown in the above-referenced applications Ser. No. 712,642 and Ser. No. 702,425 and are also shown in German Published Application 2,363,171.
  • the main piston of the interrupter is flexibly supported on an auxiliary piston and the cylinder carries a nozzle which is arranged to direct pressurized gas from the interior of the cylinder through the separating contacts of the interrupter.
  • the operating mechanism must be capable of supplying enough force to overcome the spring force of the flexible coupling between the main and auxiliary pistons.
  • the spring force which must be overcome in the above arrangement is at its greatest at the time that the contacts are approaching the end of their opening movement and precisely at the point where the greatest flow of fluid through the interrupting contacts is desired. However, since the spring force is substantially high at this point, the spring opposes the continued movement of the cylinder by the operating mechanism so that the fluid flow from the cylinder is reduced.
  • a novel arrangement of main and auxiliary pistons wherein the interspace between them is controlled by one-way valves in the piston, and whereby means are provided for connecting the pistons together at the beginning of the opening stroke of the cylinder and for connecting the auxiliary piston to the cylinder toward the end of the cylinder stroke to insure at least a constant pressure within the main cylinder for producing fluid flow through the orifice toward the end of the cylinder stroke and without exerting an undue opposition force on the operation mechanism.
  • FIG. 1 schematically illustrates a portion of a puffer interrupter in longitudinal section which incorporates the novel construction of the present invention.
  • FIG. 2 is a view similar to that of FIG. 1 and illustrates a second embodiment of the present invention.
  • the interrupter is schematically illustrated by numeral 10 and will be contained within a sealed housing (not shown).
  • the interrupter contains a tubular fixed contact 11 which cooperates with a movable pin-type interrupter contact 12.
  • the movable contact 12 is surrounded by an insulation nozzle 13 which is fixed on the end wall 14 of conductive cylinder 16.
  • the conductive cylinder 16 is movable in the direction of the double arrow 15 under the influence of a suitable operating mechanism which is schematically illustrated in FIG. 1 and may be of any desired type.
  • the interrupter terminals are also schematically illustrated in FIG. 1 as consisting of terminal 11a connected to fixed contact 11 and contact 16a which is slidably connected to the conductive cylinder 16. Note that terminals 11a and 16a will be accessible externally of the housing which encloses the interrupter of FIG. 1.
  • FIG. 1 further illustrates gas passages 17 in the end wall 14 which connects the main cylinder volume 18 within cylinder 16 to the channel 19 within nozzle 13. Note that the narrowest opening of the nozzle 13 is located adjacent to but slightly downstream of the end of movable contact 12.
  • the cylinder 16 is then arranged to move over a fixed main piston 22 which is supported on a stationary insulation piston rod 21.
  • the upper smaller diameter region of piston rod 21 slidably receives an auxiliary piston 23 which is movable relative to the fixed piston 22.
  • the fixed piston 22 is provided with a peripheral annular seal ring 11a for forming a seal to the interior of cylinder 16 and a similar sliding seal 23a is provided for the auxiliary piston 23.
  • an internal ring 23b extends between piston rod 21 and auxiliary piston 23.
  • auxiliary volume 24 is then defined between the relatively movable main piston 22 and auxiliary piston 23, which volume will depend on the relative positions of the two pistons.
  • Volumes 18 and 24 are interconnected by two valves in the main piston 22.
  • the first of these valves is an unloaded check valve 25 which may be of any conventional ball type or other type, which valve 25 remains closed so long as the pressure in volume 18 is greater than the pressure in volume 24.
  • the second valve in piston 22 is a pressure-limiting valve 27 loaded by a calibrating spring 26, which valve maintains a constant pressure gradient between the volumes 18 and 24.
  • FIG. 1 also illustrates in dotted lines that the valve 27 could be installed in a conduit extending between volume 18 and volume 24, schematically illustrated as conduit 22', which contains a pressure-limiting valve 27'.
  • the auxiliary piston 23 is also provided with an unloaded check valve 29 which opens toward volume 24 and remains closed so long as the pressure within volume 24 is higher than that in the external volume 30 below the auxiliary piston 23.
  • auxiliary piston 23 In order to selectively connect auxiliary piston 23 to either the main piston 22 or the cylinder 16, the auxiliary piston 23 is provided with the pivotal connection member 31, which pivotally receives one end of the crank arm 32.
  • the vertex of the crank arm 32 has a roller 33 rotatably mounted thereon, and also has a roller 34 rotatably mounted thereon. Roller 33 then rolls over the circular section of insulation rod 21 and can be latched by the shoulder 35 of the insulation rod 21, as shown in FIG. 1. At the same time, the roller 34 runs over a slide block 36 which is fixed within the inside of the cylinder 16.
  • slide block 36 has a circular depression 37 therein which can receive the roller 34 when the slide block 36 aligns depression 37 with the roller 34.
  • the operating mechanism moves the cylinder 16 downwardly and the volume 18 is compressed and forces gas such as sulfur hexafluoride through the nozzle 13 and between the separating contacts 11 and 12.
  • the pressure within volume 18 and thus the driving force required to move cylinder 16 increases constantly as the cylinder 16 moves downwardly so long as pistons 22 and 23 are coupled together.
  • the roller 33 will roll over the shoulder 35.
  • the auxiliary piston 23 is then latched to the cylinder 16 and moves downwardly with the cylinder 16.
  • the main cylinder volume 18 continues to reduce so that gas continues to be expelled from the volume 18 through the nozzle 13.
  • the volume 24 is increasing and the pressure gradient between the decreasing volume 18 and the increasing volume 24 remains constant due to the pressure-limiting valve 27.
  • the check valve 29 in piston 23 will open to admit more gas into volume 24.
  • the response pressure of the pressure-limiting valve 27 and the length of the stroke of cylinder 16 until pistons 22 and 23 are uncoupled from each other are advantageously matched so that the pressure in proportion to the external volume 30 in volume 18 at the end of this stroke will correspond approximately to the sum of the response pressure of pressure-limiting valve 27 and of the pressure in volume 24.
  • the operating mechanism has to work only with the response pressure of pressure-limiting valve 27.
  • the cylinder 16 In order to reclose the interrupter, the cylinder 16 is moved upwardly by the operating mechanism, with the auxiliary piston 23 locked thereto and the above operations are repeated in a reverse order, with the check valves 25 and 29 opening to draw fresh gas into volumes 18 and 24 from the volume 30.
  • FIG. 2 shows a second embodiment of the invention wherein components identical to those of FIG. 1 have been given similar identifying numerals.
  • FIG. 2 differs from FIG. 1 in the construction and arrangement of the main piston 22 and auxiliary piston 23.
  • the auxiliary piston 23 in FIG. 1 consists of a cup-shaped member 39 which is movable within the cylinder 16, with the cup-shaped member 39 receiving the main stationary piston 22.
  • the cylinder 16 is also formed with an internal shoulder 40 which faces pistons 22 and 23, where the larger internal diameter of cylinder 16 receives the outer diameter of auxiliary piston 39, while the smaller diameter of cylinder 16 corresponds to the outer diameter of the main piston 22.
  • the depression 37 in the slide plate 36 is selected such that the auxiliary piston 23 is locked to cylinder 16 when the top of cup-shaped member 39 reaches shoulder 40.

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  • Circuit Breakers (AREA)
  • Reciprocating Pumps (AREA)
US05/724,617 1975-09-26 1976-09-20 Puffer interrupter with main and auxiliary pistons and common cylinder Expired - Lifetime US4103131A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH12542/75 1975-09-26
CH1254275A CH590552A5 (el) 1975-09-26 1975-09-26

Publications (1)

Publication Number Publication Date
US4103131A true US4103131A (en) 1978-07-25

Family

ID=4384003

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/724,617 Expired - Lifetime US4103131A (en) 1975-09-26 1976-09-20 Puffer interrupter with main and auxiliary pistons and common cylinder

Country Status (5)

Country Link
US (1) US4103131A (el)
AT (1) AT355665B (el)
CH (1) CH590552A5 (el)
DE (1) DE2620698A1 (el)
FR (1) FR2326023A1 (el)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556767A (en) * 1983-05-31 1985-12-03 Bbc Brown, Boveri & Company, Ltd. Gas-blast circuit breaker
US5567923A (en) * 1994-01-25 1996-10-22 Gec Alsthom T&D Sa Puffer circuit-breaker having a pneumatically-locked semi-moving piston
US5587571A (en) * 1994-01-25 1996-12-24 Gec Alstom T & D Sa Combined-action puffer circuit-breaker
US20050045595A1 (en) * 2003-09-03 2005-03-03 Christian Daehler Pressure-limiting valve for a puffer interrupter assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015946A1 (de) * 1980-04-25 1981-10-29 Brown, Boveri & Cie Ag, 6800 Mannheim Blaskolbenschalter
CH655611B (el) * 1981-06-18 1986-04-30
DE3231169A1 (de) * 1982-08-21 1984-02-23 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Blaskolbenschalter
FR2559615B1 (fr) * 1984-02-15 1987-02-27 Alsthom Atlantique Disjoncteur a gaz comprime
DE3438635A1 (de) * 1984-09-26 1986-04-03 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Druckgasschalter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913559A (en) * 1958-01-30 1959-11-17 Westinghouse Electric Corp Fluid-blast circuit interrupter
DE1216407B (de) * 1960-05-27 1966-05-12 Calor Emag Elektrizitaets Ag Elektrischer Schalter mit selbsterzeugter Loeschmittel-, insbesondere Druckgasstroemung
US3955057A (en) * 1973-10-01 1976-05-04 Brown, Boveri & Cie. A.G. Electric switch

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1765153A1 (de) * 1967-04-13 1971-07-01 Magrini Fab Riun Scarpa Selbstloeschender elektrischer Gasdruckschalter mit Schaltkammer mit einer Muendungsoeffnung
JPS4981874A (el) * 1972-12-14 1974-08-07
FR2291601A1 (fr) * 1974-11-15 1976-06-11 Alsthom Cgee Dispositif de coupure a autocompression

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913559A (en) * 1958-01-30 1959-11-17 Westinghouse Electric Corp Fluid-blast circuit interrupter
DE1216407B (de) * 1960-05-27 1966-05-12 Calor Emag Elektrizitaets Ag Elektrischer Schalter mit selbsterzeugter Loeschmittel-, insbesondere Druckgasstroemung
US3955057A (en) * 1973-10-01 1976-05-04 Brown, Boveri & Cie. A.G. Electric switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556767A (en) * 1983-05-31 1985-12-03 Bbc Brown, Boveri & Company, Ltd. Gas-blast circuit breaker
US5567923A (en) * 1994-01-25 1996-10-22 Gec Alsthom T&D Sa Puffer circuit-breaker having a pneumatically-locked semi-moving piston
US5587571A (en) * 1994-01-25 1996-12-24 Gec Alstom T & D Sa Combined-action puffer circuit-breaker
CN1071483C (zh) * 1994-01-25 2001-09-19 Gec阿尔斯托姆T&D公司 带有气动闭锁的半运动活塞的气吹断路器
US20050045595A1 (en) * 2003-09-03 2005-03-03 Christian Daehler Pressure-limiting valve for a puffer interrupter assembly

Also Published As

Publication number Publication date
DE2620698A1 (de) 1977-04-07
CH590552A5 (el) 1977-08-15
AT355665B (de) 1980-03-10
FR2326023B1 (el) 1981-05-29
ATA631576A (de) 1979-08-15
FR2326023A1 (fr) 1977-04-22

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